【摘要】：隨著Intemet的發(fā)展和后PC時代的到來,嵌入式系統(tǒng)的應(yīng)用日益廣泛,嵌入式系統(tǒng)以其內(nèi)核小、專用性強、系統(tǒng)精簡、高實時性等特點,在各領(lǐng)域取得了廣泛應(yīng)用。三星公司出產(chǎn)的ARM系列S3C2440處理器以其低價格、低功耗等優(yōu)勢在工控設(shè)備、PDA等領(lǐng)域占有了重要的市場份額。同時支持ARM技術(shù)的嵌入式Linux操作系統(tǒng),具有內(nèi)核可裁減、代碼開放等特點,將Linux操作系統(tǒng)應(yīng)用到嵌入式系統(tǒng)中,可以充分發(fā)揮ARM和Linux兩者的優(yōu)勢。本文描述的即是基于此軟硬件環(huán)境,利用藍牙技術(shù)實現(xiàn)的無線區(qū)域通信系統(tǒng)。 藍牙技術(shù)作為一種全球開放的無線通信技術(shù)標準,為用戶提供低成本、低功耗的短距離無線連接。藍牙V4.0規(guī)范,是藍牙發(fā)展史上一次史無前例的重大轉(zhuǎn)折點,將迎來的是高速無線數(shù)據(jù)傳輸時代。該規(guī)范在低功耗模式下,把藍牙的傳輸距離增加到了100米以上,藍牙的應(yīng)用在不久的將來會進一步得到了極大的擴展。 針對以上情況,本文提出了開發(fā)基于ARM-Linux的無線區(qū)域通信系統(tǒng)的設(shè)想,并對其進行了深入的研究和探討。主要理論研究與實驗成果包含以下幾個方面： (1)分析當前主流無線技術(shù)的發(fā)展現(xiàn)狀及性能優(yōu)劣,進行綜合比較,結(jié)合藍牙技術(shù)具體狀況,選用TTL串口藍牙模塊；探討多種嵌入式處理器的特點和應(yīng)用范圍,著重研究了ARM系列處理器的性能特點,以ARM9核心板配備底板作為實驗開發(fā)板；集成三星3.5寸LCD觸摸屏,通過Framebuffer應(yīng)用程序接口,控制LCD顯示屏將系統(tǒng)向用戶提供的服務(wù)和反饋的信息顯示出來；詳細了解電阻式觸摸屏的工作原理,實現(xiàn)從外界接收數(shù)據(jù)輸入,實現(xiàn)人機交互界面。 (2)深入分析當今具有影響力的嵌入式操作系統(tǒng),從成本、維護、硬件支持、GUI界面等多方因素進行對比評析,著重敘述了最為適合本文應(yīng)用開發(fā)的Linux操作系統(tǒng)；在利用u-boot作為bootload啟動開發(fā)板之后,將操作系統(tǒng)移植并固化到核心板的存儲區(qū)。 (3)應(yīng)用程序的開發(fā)與實現(xiàn)。描述開發(fā)板與藍牙模塊的結(jié)構(gòu)和接口,通過TTL串口實現(xiàn)兩者的硬件連接；簡單了解藍牙協(xié)議棧,使用模擬串口方式進行藍牙技術(shù)開發(fā)；人際交互有多個界面設(shè)計：提示性界面、搜索結(jié)果顯示、數(shù)據(jù)輸入界面、發(fā)送、顯示接收數(shù)據(jù)界面等；在主機PC機上完成搜索設(shè)備、與遠程建立連接、發(fā)送信息、接收并顯示信息等功能的設(shè)計與開發(fā),利用交叉編譯工具編譯之后,生成可執(zhí)行文件移植進開發(fā)板,從而實現(xiàn)整個無線區(qū)域信息交流系統(tǒng)。 本文實現(xiàn)了基于ARM-Linux的無線區(qū)域范圍內(nèi)設(shè)備搜索、英文信息發(fā)送和接收等基本通信功能,且操作簡單；但人機交互界面設(shè)計不夠精細,漢字傳輸與字體庫函數(shù)的移植等都有待今后進一步的研究與完善。
[Abstract]:With the development of Intemet and the coming of post-PC era, embedded system has been widely used in various fields because of its small kernel, strong specificity, simple system, high real-time and so on. Samsung produced ARM series S3C2440 processor with its low price, low power consumption and other advantages in industrial control equipment, PDA and other areas of the important market share. At the same time, the embedded Linux operating system, which supports the ARM technology, has the characteristics of reducing the kernel and opening the code. The application of the Linux operating system to the embedded system can give full play to the advantages of both ARM and Linux. This paper describes a wireless area communication system based on Bluetooth technology, which is based on this software and hardware environment. Bluetooth technology, as a global open wireless communication technology standard, provides low-cost, low-power short-distance wireless connectivity for users. Bluetooth v4.0 specification is an unprecedented turning point in the history of Bluetooth, and will usher in the era of high-speed wireless data transmission. In low power consumption mode, the transmission distance of Bluetooth is increased to more than 100 meters, and the application of Bluetooth will be greatly expanded in the near future. In view of the above situation, this paper puts forward the idea of developing the wireless area communication system based on ARM-Linux, and makes a deep research and discussion on it. The main theoretical research and experimental results include the following aspects: (1) analyze the current mainstream wireless technology development status and performance advantages and disadvantages, make a comprehensive comparison, combined with the specific situation of Bluetooth technology, select TTL serial Bluetooth module; The characteristics and application range of many embedded processors are discussed, and the performance characteristics of ARM series processors are studied emphatically. The ARM9 core board is equipped with backplane as the experimental development board. Samsung 3.5-inch LCD touch screen integration, through the Framebuffer application program interface, control the LCD display system to provide services and feedback information to display; Understand the principle of resistive touch screen in detail, realize receiving data input from outside world and realizing human-computer interface. (2) analyzing the influential embedded operating system, comparing and analyzing the factors such as cost, maintenance, hardware support, GUI interface and so on, focusing on the Linux operating system which is the most suitable for the application and development of this paper. After using u-boot as the bootload boot development board, the operating system is transplanted and solidified to the storage area of the core board. (3) the development and implementation of the application program. The structure and interface of the development board and Bluetooth module are described, the hardware connection between them is realized by TTL serial port, the Bluetooth protocol stack is simply understood, and the Bluetooth technology is developed by analog serial port. There are several interface designs for interpersonal interaction: cue interface, search result display, data input interface, sending, display receiving data interface and so on. After completing the search device on the host PC, establishing remote connection, sending information, receiving and displaying information, and so on, after compiling with the cross-compiling tool, the executable file will be transplanted into the development board. Thus the whole wireless area information exchange system is realized. In this paper, the basic communication functions such as device search, English information sending and receiving based on ARM-Linux in wireless area are realized, and the operation is simple. However, the design of human-computer interface is not fine enough. The transfer of Chinese characters and the transplantation of font library functions need to be further studied and perfected in the future.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TN92;TP368.1

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